DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127 Issue 1
August 1997
Maintenance Object Repair Procedures

Page10-211CABINET (Cabinet Sensors)

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Figure 10-10. Multicarrier Cabinet Environment Components (CABINET) [Non-Variable Speed Fan Option]Sensor S1 informs the Maintenance/Tape Processor, the Duplication Interface circuit pack, or the EPN Maintenance circuit pack when the temperature at the top of the cabinet reaches 650 C (1490 F). Sensor S2 is not monitored by any circuit pack. However, when the temperature at the top of the cabinet reaches 700 C (1580 F), this sensor causes the Power Distribution Unit to shut down power to the entire cabinet. At this point, Emergency Transfer is invoked, and no other system functions are provided.The S3 and S4 sensors constantly report the temperature at the air exhaust in the cabinet (top and bottom S3 sensors) and at the air intake (S4 sensors). The AHD1 circuit pack uses this information to determine fan speed and air flow alarm state. If there is at least a 15 0C (27 0F) air temperature difference between
631
DA
CARRIER A
FILTER
A
H
631
DA
631
DB
631
DB
CARRIER B
F
L
O
W
S4
FILTER
AC
AC
AC
A
FANS -3 FRONT
3 BACK
F1
D
S4
1
S2 S3 S1
631
DA
AC
F3
CARRIER C 631
A
I
RDB
AC
F2
631
DA
631
DA
631
DB
631
DB
F4
CARRIER D
CARRIER E
I
R
F
L
O
W
DC
FUSE F1-F7
F5
F6 F7
DC
BATTERY
CHARGER
BATTERY & AC
DIST.
RING
S3
GENERATOR
ON BACK OF
PDU, FUSE
F9 ON FRONT
OF PDU
F9
POWER DISTRIBUTION UNIT